1. Preparation Methods of Carbon Nanotubes

    Edinilson José Slabei1, Alfredo Bruger Junior1, Elias da Costa2, Gino Capobianco3

    1. Production Engineering – UNIGUAÇU

    2. Universidade Estadual do Paraná – UNESPAR


    Abstract: The present work presents the study of the use of carbon nanotubes (CNTs), aiming to improve the mechanical properties of basalt derivatives. In this first stage of the research, the main methods of preparation of CNTs were evaluated, showing the temperatures, the main catalysts used the types of carbon nanotubes, ways to obtain higher quality CNT and higher performance methods. As results, it was possible to report that the methods that stand out are the CVD (chemical vapor deposition), current arc and laser ablation, with CVD being the most used. The results are preliminary and base to report results regarding the application of nanotubes in the improvement of basalt derivatives in future research.

    Keywords: Carbon Nanotubes, CNT, methods of preparation.

    Pages: 151 – 159 | Full PDF Paper
  2. The Effects of Organic and Inorganic Fertilizers on Rice Nutrients and Soil Properties in Taungoo University Campus

    Nay Thwe Kyi, Kyaw Zan Aung

    Department of Chemistry, Myeik University, Myanmar.

    Abstract: Agricultural systems are a major factor affecting human health. Soil is one of the important factors for successful cropping in agriculture. The objective of this research was to investigate the effects of control, organic and inorganic fertilizers on soil properties and rice nutrients at Taungoo University Farm. The experiment comprised three treatments viz., control (without fertilizer), organic farming (organic manures including paddy and black gram straw, cow dung) and conventional farming (chemical fertilizers including N, P, K). Soil samples were collected before and after paddy cultivation and analyzed to study the changes in soil properties as influenced by organic farming. Increase in physicochemical properties (moisture, organic carbon, humus), nutrients (N, P, K) and decrease in Fe, Mg contents were noticed in the soil under organic farming when compared to conventional and control farming after paddy cultivation. The nutritional values of the collected rice samples from organic, conventional and control farming such as moisture, ash, fat, fiber and protein were determined by AOAC methods. Mineral contents of rice samples such as K, Na, Ca, Mg and Fe were determined by atomic absorption spectrophotometer. A substantial increase in protein, fiber and decrease in fat were observed in the rice under organic farming. In the above context, it was observed that organic fertilizer caused better quality, safety and nutrition of rice as well as richer soil health.

    Keywords: Control farming, organic farming, conventional farming, physicochemical properties and nutrients of soil, nutritional values and mineral contents of rice.

    Pages: 160 – 171 | Full PDF Paper